M5 M6 M7 M9 Hex Hexagon Bolt Countersunk From Tengri

• Customization: Available
• Material: Carbon Steel
• Type: Countersunk Head
• Model NO.: DIN, ANSI, GB
• Groove: Cross
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, GB, ANSI, BSW, JIS, GOST
• Grade: A2-70/A2-80
• Product Name: Sem Screw
• Drawing: Accept
• Sample: Free Sample When Is in Stock
• Thread: Unc
• Service: Custom-Made Service
• Color: Yellow Zinc Platd
• Transport Package: Plastic Bags and Cartons
• Specification: M4-M20
• Trademark: Tengri
• Origin: China
• HS Code: 7318159090
• Production Capacity: 3000000 Pieces/ Month
• Package Size: 25.00cm * 25.00cm * 30.00cm
• Package Gross Weight: 1.500kg

Product Description

High Strength M3 M8 M12 Counter Sink Bolt Head Screw

Standard	Sem screws
Diameter	M2-M12
sample service	Free sample but freight cost is paid by customers(when sample is in stock) sample fee(when samples need to be customized)
Material	SS304,SS316,SS2205,SS2507
MOQ	1000
Surface treatment	Plain, black oxide
Package	Plastic bag, Boxes and cartons, Pallets, Customized
Price terms	EXW, FOB, CIF, etc.
Payment terms	T/T, Paypal, L/C, Western union, etc.
Certifications	ISO 9001
Note	Free Samples could be provided for standard fastener

We need more detail as follow. This will allow us to give you an accurate quotation. 
Before offer the price,get the quote simply by completing and submitting the form below:
• Product: _______            
• Measure: _______( Diameter) x_______(Length)
• Order Quantity: _________________pcs
• Surface treatment: _________________
• Material: _________________
• When do you need it by? __________________
• Where to Shipping: _______________ (Country with postal code please) 
• Email your drawing ( jpeg, png or pdf, word) with minimum 300 dpi resolution for good clarity.
 

Product Description

What is a SEMS Screw?

A SEMS Screw is a generic term used to describe a screw pre-assembled with a free-spinning lock washer. It is a permanent assembly with the washer held in place by the major diameter of the screw thread being larger than the hole of the washer. The SEMS screw is simple, easy to use and available in many different styles making it well suited for many applications.

Advantages of the SEMS Screw:

• Low cost and widely available
• Increases productivity by eliminating hand assembly of individual components
• Permanent assembly assures that the washer is not dropped, lost or forgotten
• Ease of use with hand drivers and in automated production programs
• Available in most screw and washer combinations

Key Considerations When Choosing SEMS Screws:

• Select the correct configuration for the specific task at hand
• Good design ensures savings in the long run
• Proper finishes perform optimally and are aesthetically pleasing
• Ease of use, particularly in difficult spaces

Detailed Photos

Double Washer Sem Screw

Screw and washer assemblies, or SEMS screws are generally covered by the specification ASME B18-13 1996.  Typically, double washers consist of a split lock washer and a flat washer. They are readily available in metric sizes. Special double washer sems can be made for application specific needs.

Flat Washer Options are generally divided into a washer series of Narrow, Regular, and Wide Sizes.  The size chart is below.
Lock Washer Options - While typically a split lockwasher; internal tooth lockwashers and external tooth lockwashers can also be assembled.
Material Options are generally steel, stainless steel, and brass.
 

Thread Size d		M3	M4	M5	M6
P	Pitch	0.5	0.7	0.8	1
a	max	1	1.4	1.6	2
b	min	25	38	38	38
k	max	2.4	3.1	3.7	4.6
	min	2.26	2.92	3.52	4.3
h	Nominal Size	0.5	0.8	1	1.6
H	Nominal Size	1.5	2	2.75	3.25
D1	Nominal Size	7	9	10	12
D2	Ref.	5.23	6.78	8.75	10.71
Socket No.		1	2	2	3

External Tooth Lock washer SEMS

SEMS with captive, external tooth washers provide extra gripping power and control during assembly. APEX provides external tooth lockwasher SEMS in a wide range of sizes and materials.
 

Thread Size d		M3	M4	M5	M6
a	max	1	1.4	1.6	2
b	min	25	38	38	38
h	≈	1.2	1.5	1.8	1.8
dc	Nominal Size	6	8	10	11

 

Internal Tooth Lock washer SEM Screw

SEMS with captive, internal tooth washers provide extra gripping power and control during assembly. APEX provides internal tooth lockwasher SEMS in a wide range of sizes and materials. The internal facing of the washer provides for a neat finished appearance.
 

 

Split Lock Washer Sem Screw

Extensively used in automotive and aerospace where a locking fastener needs to be inserted into a narrow hole, split lockwasher Sems are also available for more common applications.













 

Thread Size d		M3	M4	M5	M6
a	max	1	1.4	1.6	2
b	min	25	38	38	38
H	Nominal Size	1.5	2	2.75	3.25
dc	Ref.	5.23	6.78	8.75	10.71

 

 

Square Cone Sem Screw

Square Cone SEMS offer compensation against vibration and thermal cycling. They accept a high clamp load while still maintaining spring action. The Square Cone washer provides locking action while avoiding damage to the mating surface. This fastener is ideal for circuit board applications as well.

 

Surface Treatment

Application

Quality Control

Company Profile

Tengri fasteners Group is an OEM Fasteners Manufacturing, Plating/ Finishing and Industrial Production Company. Over 30 years of manufacturing stainless steel fasteners, industry experience and construction of state-of-art facility. We can offer the most common stainless steel fasteners or specially designed fasteners to exceed our customer's expectations, as our vendors are the best name brands in the industry.

Tengri fasteners group employs more than 3000 employees and consists of one lab and software center, 3 wholly owned subsidiary of Factory and 5 warehouse stocking locations. Our extensive products line and our fast and friendly sales representatives are able to satisfy our customer demands.

As a veritable "one- stop shop", Tengri Fasteners offers same day delivery of in-stock items and a wide a wide variety of supply chair solutions tailored to the needs of our customers. Our custom inventory control programs provide extensive cost saving to our customers.


Factory Images
    


Company Certifications


Customers



Our Service

a)  Good after-sale service, all questions will be replied within 12 hours.

b)  Customized design is available. ODM&OEM are welcomed.

c)  We can provide free sample, consumer should pay the freight first.

d)  Convenient transportation and fast delivery, all available shipping ways could be     applied, by express, air or sea. 

e)  High quality and most competitive price.

f)  Advanced produce and inspecting equipments.

Packaging & Transportation

FAQ

1.Can I order a small list ?

---Of course, you can.

2.What quote do you offer?
---FOB , CIF and others ways according the your needs.
 
3.How transport?
---Sea Freight, Air Freight and others Express Delivery ways for you.
 
4.What is the quality of your products guarantee?
---We have passed ISO9001:2015 Quality Management System Certification, CQM Quality Management System Certification and IQNet Quality Management System Certification, If the quality doesn't  accord the standard, you can exchange the goods for free.
 
5.Do you have after-sales service?
---Certainly,you can contact us at any time.